Many fandoms should do as classic gamers (such as
@Randall Fragg) have always done when adversity hits, and enter the long sleep. Let's say you have a time when all the new content is shit, complaining about it isn't helping, And every new arrival is worse than the last. The work is pandering to people who really shouldn't be pandered to, you're getting content on par with the Complete Book of Elves, and all it's doing is piss people off. Corporate sure as shit isn't listening to you.
What is one to do?
You retreat to the proverbial Fortress of Solitude. You play early edition and homebrew shit in the case of tabletop games. In the case of Vidya or books/movies, you play the older edition games, read the appropriate books, or watch the right movies to assure yourself that yes, they were actually good at one point. You do other shit, too. Play games you've not tried before, touch base with cool ideas you never considered. "Oh shit, that new cyborg mermaid RPG is out? Fuck, I gotta check that shit out." You make fun of silly shit like FATAL or that horrible witch RPG that is loaded to the gills with the author's fetishes.
You do this and you wait. Eventually, the stupid will burn itself out. It always does, either because the person responsible gets ejected from the industry or inevitably money runs out and the thing goes bankrupt. Either is technically a win, since the former can result in the thing cleaning up its act and the latter at worst means it can't be hurt anymore and at best means it will get a proper resurgence.
We've been down this road, we've survived once before, we'll do so again.